The U.S. troops have come "under fire" and have "returned fire" in and around Mosul, as allied forces tried to retake the city from ISIS.
"When someone is shooting at you, that is combat," Fox News quotes Col. John Dorrian, the Baghdad-based spokesman as saying.
The news comes days after the U.S. commander of American and allied forces in Iraq and Syria told Fox News and other traveling press in Baghdad that U.S. troops were operating closer than ever to the front lines.
ISIS is estimated to have between 1,000 and 3,000 fighters in Mosul.
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